Errors with 3C595

[Guillaume Girard]

I'm using 3C595 cards on two boxes (a web server and a web proxy), and
I'm getting errors woth both :

- Web proxy : kernel 2.0.34

eth0: 3Com 3c595 Vortex 100baseTX at 0x8100, 00:a0:24:cf:57:75, IRQ 11
  64K word-wide RAM 3:1 Rx:Tx split, autoselect/10baseT interface.
eth0: Overriding PCI latency timer (CFLT) setting of 32, new value is
248.
3c59x.c:v0.99E 5/12/98 Donald Becker
http://cesdis.gsfc.nasa.gov/linux/drivers/vortex.html

On high load the network blocks and syslog sends errors like :

eth0: Transmit error, Tx status register c0.
eth0: Transmit error, Tx status register 90.
...

- Web server : kernel 2.0.37-pre8 (SMP)

3c59x.c:v0.99H 11/17/98 Donald Becker
http://cesdis.gsfc.nasa.gov/linux/drivers/vortex.html
eth0: 3Com 3c595 Vortex 100baseTx at 0xe000,  00:a0:24:cf:57:29, IRQ 11
  64K word-wide RAM 3:1 Rx:Tx split, autoselect/10baseT interface.
eth0: Overriding PCI latency timer (CFLT) setting of 32, new value is
248.

When dowloading a 340Mb tar.gz file from the server (on local network),
the transfer stopped after 40Mb and network was dead (but not the box).
I had to reboot it to get everything working again (warm reboot was
enough however).

syslog messages :

Mar 17 15:03:10 joyeux kernel: eth0: transmit timed out, tx_status 00
status e000.
Mar 17 15:03:42 joyeux last message repeated 12 times
Mar 17 15:04:43 joyeux last message repeated 19 times
Mar 17 15:05:46 joyeux last message repeated 21 times
Mar 17 15:06:52 joyeux last message repeated 21 times
Mar 17 15:07:54 joyeux last message repeated 9 times
...

Should I suspect the cards or is there a small bug in driver for 3C595 ?

Guillaume.